Tuning device



R. A. BIDLACK TUNING DEVICE Jan. 23, 1988 3 Sheets-Shee't l Filed Oct. 20, 1965 Jan. 23, 1968 R. A. BIDLAcK 3,364,753

TUNING DEVICE Filed Oct. 20, 1965 3 Sheets-Sheet 2 Jan. 23, 1968 R. A. BIDLAcK 3,364,753

TUNING DEVICE Filed OC'L. 20, 1965 3 Sheets-Sheet 5 91 UH F 9.5' FINE TUNE U H F COURSE TUNE United States Patent Office Patented Jan. 23, 1968 3,364,753 TUNING DEVICE Robert A. Bidiaclr, Chicago, Ill., assignor to Motorola, Inc., Franlriin Park, il., a corporation of Illinois Filed Oct. 20, 1965, Ser. No. 498,998 8 Claims. (Cl. 74-10.45)

AS'IRACT GF THE DISCLOSURE This tuner for a television receiver uses a rotating member that has first and second gear segments spaced about the periphery of it. A first gear train is connected to the UHP tuner and a second gear train is connected to the VHP tuner. One of the gear segments engages the first gear train during a portion of the rotation of the member to drive the UHP tuner, and the other gear segment engages the second gear train to drive the VHP tuner during a portion of rotation of the member different from that portion of rotation driving the first gear train. A channel selector knob is connected to the rotating member and may be turned in a clockwise or counterclock- Wise direction through more than 360 to tune the receiver through the UHP and VHP bands. A second knob connected to a third gear train utilizing a clutch assembly provides for fine tuning of both the VHP and UHP tuners. A drive back gear train driven by the channel selector shaft positions a single dial to indicate the VHP or UHP channel to which the receiver is tuned.

This invention pertains generally to a multi-ban I signal tuning unit and more particularly to separate UHP and VHP tuners for a television receiver combined for adjustment of both units with one tuning knob for coarse tuning and one knob for fine tuning.

Separate VHP ad UHP tuners and associated individual tuning controls are used in the television industry at the present time, mainly because it has been found difiicult to provide a single tuning unit with desirable manual controls for selection in the entire Spectrum of television frequencies.

Numerous tuning arrangements for the coordination and control of the two separate tuning units have been proposed to enhance cabnet styling and decrease costs, but for the most part they have been relatively complicated and require more from the Consumer than the turning of the control knob. Since simplicity is the keynote for saleability, television manufacturers have been hesitant to incorporate these complicated devices into television receivers. Devices are known that use a single knob for tuning both VHP and UHP tuners, and a single dial scale indicating the selected channel. Generally these cannot be tuned continuously in a clockwise or counterclockwise manner, but can be tuned only between stops at the lower end of the VHP band and the high end of the UHP band.

It is an object of this invention to provide an improved unit for adjusting both the VHP and UHF tuners of a television receiver with a single tuning knob for coarse adjustment and a single knob for fine tuning.

It is another object of this invention to provide a device for tuning both the VHP and UHP tuners of a television receiver with a single tuning knob that can be rotated continuously in either a clockwise or counterclockwise direction.

A further object of this invention is to provide a device for tuning both the VHP and UHP tuners of a television receiver and wherein a single dial scale indicates the tuner setting for any adjustment to appear as though the device comprises one continuous tuner.

A feature of this invention is a multi-band tuning unit including a VHP and UHP tuner means having a rotatable member continuously engaging at least one of the VHP and UHP tuner means and having a periphery providing a driving relation of the same about a portion thereof and a non-driving relation about the remainder thereof. A single channel selector shaft rotates the rotatable member to tune the unit through the VHF-UHP Channels.

Another feature of this invention is a device for tuning a television receiver capable of receiving VHP and UHP Channels in which there is a rotatable member which is an intermittent gear with a first gear segment about the periphery for engaging and driving the VHP tuner for a portion of the rotation of the intermittent gear and a second gear segment adjacent the first segment on the periphery and driving the UHP tuner for the remaining portion of rotation. The gear ratio between the first gear segment and the VHP tuner and the second gear segment and the UHP tuner is different to provide the necessary mechanical advantage for driving each tuner from the single channel selector shaft.

Another feature of this invention is the device for tuning a television receiver capable of receiving UHF and VHP signals having the intermittent gear engaging both the VHP tuner and the UHP tuner means during the initial and terminal portions of rotation of the intermittent gear when the same is driving the VHP tuner so that the UHF tuner can be rotated through a blank area therein.

Still another feature of this invention is a device for tuning a television receiver including a dial scale having gear means coupled between the channel selector shaft and the dial scale for responding to rotation of the channei selector shaft to position the dial scale to indicate the channel to which the receiver is tuned.

Another feature of this invention is a device for tuning a television receiver capable of receiving VHP and UHP signals and having a fine tune gear train coupled to a fine tuning shaft connected to the VHP tuner and to the shaft for rotating the UHP tuner. Rotation of a single fine tuning knob drives the gear train to rotate the fine tuning shaft and the UHP tuner shaft.

A further feature of this invention is a device for tuning a television receiver capable of receiving VHP and UHP signals having the fine tune gear train coupled to the UHP tuner shaft by a clutch so that when the channel selector tunes the receiver to a VHP channel the intermittent gear locks the UHP tuning shaft so that rotation of the fine tuning knob fine tunes the VHP tuner, but the clutch disengages the gear train from the UHP shaft so that it cannot be turned to fine tune the UHP tuner.

Yet another feature of 'this invention is a device for tuning a television receiver capable of receiving VHP and UHF signals having the rotation of the =UHF tuner shaft during fine UHP tuning driving back to the intermittent gear and the drive back gear means coupled thereto to position the dial Scale to indicate the UHF channel to which the receiver is tuned.

In practicing this invention, a channel selector shaft is coupled to an intermittent gear which is responsive to continuous lrotation of the selector shaft either in a clockwise or counter clockwise direction to tune the television receiver through all of the VHP and UHF c'hannels. The receiver has a variable stepwise VHP tuner that includes a VHP tuner shaft and a fine tuning shaft, and 'a continuously 'variable UHP tuner that has a UHP tuning shaft. The interrnittent gear has a first gear segment on the periphery that engages with a drive gear on the VHt* tuning shaft during a portion of rotation thereof, and a second gear segment on the periphery adjacent to the first segment that engages a drive gear on the UHF tuning shaft during the remaining portiOn of rotation 3 thereof. A -drve back `gear train coupled between the selector shaft and the 'dial scale is responsive to the rotation of the selector shaft to .position the di'al soale to indicate the channel to which the receiver is tuned.

A fine tuning gear train is 'also included and is like- Wise driven by a single fine tuning knob. The gear train includes a gear that is connected to the VHP fine tuning shaft, and a gear that is coupled through 1a clutch to the UHF tuning shaft. The VHP tuner has an inoperative channel, or unused switch position, and is positioned in this channel by drive of :the intermittent 'gear just -prior to that gear engaging the UHF drive gear. Therefore, when fine tuning during the UHP channel selecting cycle, the fine tune `gear train rotates the VHP fine tune sha'fit, but because it is an unused VHP position, it has no effect on the VHP tuner. It also drives the UHP tuning shaft through the clutch to provide UHF fine tuning. As the UHP .tuner shaft rotates, it drives back to the intermittent gear and the drive back gear train to reposition the dial scale to indicate the correct UHP channel, 'as fine tuned. However, when the intermittent 'gear is engaging the VHP driving gear and the VHP tuner is in a selected channel, the rotation =of the fine tuning knob is trianslated through the fine tune gear train to fine tune the VHP tuner. Simultaneously, the intermittent gear 'acts to lock the UHF tuning shaft so that the rotating gear in the fine tune train on the UHP tuning shaft is not drivingly coupled through the clutch and although it rotates, it does not fine tune the UHP tuner.

In the drawing:

PIG. 1 is a front elevation view of the dial scale and tuner knobs of the tuning device of this invention;

PIG. 2 is 'a side elevation view of the tuning device of this invention;

PIG. 3 is a cross-section taken along the lines 3-3 of PIG. 2;

PIG. 4 is a cross-section taken along the lines 4-4 of PIG. 2;

PIG. 5 is a side elevation cross-section of the tuning device of PIG. 2;

PIG. 6 is a side elevation of the tuning device of PIG. 2 partly in phantom illustrating UHP coarse tuning in accordance with this invention;

PIG. 7 is a side elevation view of the device of PIG. 2 partly in ph'antom illustrating UHP fine tuning;

PIG. 8 is a side elevation of the tuning device of PIG. 2 partly in phantom illustrating VHP coarse tuning; and

PIG. 9 is a side elevation view of the tuning device of PIG. 2 illustrating VHP fine tuning.

PIG. 1 shows the VHP and UHP channel selector knob 10 on the front of a television receiver 12. A window 14 shows the channel number on the dial scale 15 to which the channel selector 10 is set. Directly below the 'channel selector 10 is 'a fine tuner knob 17 for fine tuning the VHP and UHP Channels to which the receiver 12 is tuned.

VHP and UHP as used in this specification refer to the 'assigned frequency spectrum for commercial television transmitting stations. The VHP band comprises a group of 12 channels each six megacycles wide and occupying the frequency bands of 54 vmegacycles to 88 megacycles and 174 megacycles to 216 megacycles. The UHP frequency band includes some 70 channels each 51x megacycles Wide and occupying the frequency band of 470 megacycles to 890 megacycles.

PIGS. 2 through 5 illustrate the construction of the device 20 for providing single knob tuning of the VHP tuner 22 and the UHP tuner 23 by rotating the channel selector knob 10. The VHP tuner 22 has a VHP tuning shaft 24 (PIG. 5) that is mounted concentrioally with and journaled within the VHP fine tuning sleeve or shaft 25 (PIG. 2). The shaft 24 is connected to a multiplesection band switch 27, the construction and openation of which is well known in the art and is rotated for variable stepwise selection of the VHP television channels. The shaft 24 may be turned to any 'one of 13 positions, twelve of which correspond to VHP Channels 2 through 13, and the 13th or channel one position which correspo-nds to the oif or inoperative position of the VHP tuner 22. With the tuner in this inoperative channel the fine tuning slug associated with any of the VHP Channels. The

ingslugassociat ed with any of zthe VHP channels. The UHP tuner 23 is of the continuously-variable type with a blank area and includes a UHP tuner shaft 29. Brackets 30 and 31 mount the UHP tuner 23 and VHP tuner 22 respectively to a suppont 'panel 33 in the TV receiver 12. The panel 33 in turn is supported by the panel 34 of the receiver 12.

The channel selector knob 10 is connected to a selector shaft 35 which is rotatably supported by the panel 33. Connected to the shaft 35 is a channel selector drive gear 37. The gear 37 engages the gear 39 to form a drive gear train. The gear 39 is connected to a concentn'c shaft 40 which is supported by and free to rotate the VHP shaft 24 passing through it. Two idler gears are mounted adjacent gear 39 and the shaft 40. idler gear 42 is outboard the front panel 34 and is engaged with gear 43 to form a drive back gear train to position the dial scale 15 which is mounted to gear 43. The second idler gear 45 engages another idler gear 46 which is integral with the intermittent gear 48. The idler gear 46 and intermittent gear 48 are connected to a sleeve 50 which is supported by and free to rotate on the selector shaft 35. The intermittent gear 48 has a first gear segment 52 on the periphery thereof that engages the UHP tuner drive gear 54, which gear 54 is connected to the UHP tuning shaft 29. A second gear segment 55 adjacent the segment 54 on the periphery of the intermittent gear 48 engages the VHP drive gear 58 which is connected to the VHP tuning shaft 24.

By referring to PIGS. 3 and 4, the interaction of the intermittent gear 48 and the drive gears 54 and 58 may be better understood. The gear segment 52 which engages the U-HP drive gear 54 has a total of 28 teeth and a blank spot 60 which does not engage the drive gear 54 during a portion of the rotation of intermittent gear 48. The gear segment 55 has a total of 22 teeth which engages with the VHP drive gear 58, and a blank spot 62 which does not engage the gear 58 during that portion of rotation of the intermittent gear when the segment 52 is engaging the UHP dn've gear 54. A web portion 65 blanks three teeth on the VHP drive gear 58. This web portion 65 contacts the blank 62 on the intermittent gear 48 in a friction contact, when the gear 48 is in a driving relation With UHP drive gear 54 thereby eifectively locking the VHP drive gear 58. The web portion 65 also prevents interference as the teeth of gear segment 55 come into mesh with the drive gear 58. Another web portion 61 blanks three teeth on the UHP drive gear 54 (PIG. 3). This web portion 61 engages the blank spot 50 on intermittent gear 48 in a friction contact when the gear segment 55 is engaging the VHP drive gear 58, thereby etfectively looking the UHP drive gear 54. The web portion 61 also prevents interference as the teeth of the gear segment 52 come into mesh with the drive gear 54.

Because the 'UHP tuner 23 in this particular embodiment has a blank area, it is necessary to rotate the tuner through this area during the time that VHP tuning is taking place to insure that when the UHP tuner is rotated, by the channel selector 10, it will be positioned to tune through the UHP band. To accomplish this, the gear segment 52 has three more teeth on either end thereof than does the segment 55. Therefore, when segment 55 engages the VHP drive gear 58 at the beginning of VHP tuning, the UHP drive gear 54 continues to be driven by the segment 52 for three teeth. This rotates the UHP tuner through one-half of the blank area. This is illustrated in PIG. 4 where, if the intermittent gear 48 is rotated in a clockwise direction, the three teeth of segment 52 will continue to rotate the UHP drive gear 54. At the same time, the segment S5 is commencing to engage VHP drive gear SS to initiate VHP tuning. Continued rotation of the interrnittent gear 48 in a clockwise direction through the VHP channels would cause the three additional teeth at the other of segment 52. (these teeth are hidden by the web portion 65 of gear 58 in PIG. 4) to engage the UHP drive gear 54 near the terminous of rotation of the VHP drive gear 53 by segment 55. The rotation of UHP drive gear 54 by these three teeth completes the rotation of UHP tuner 23 through the remaining one-half of the blank area. Therefore, continued rotation on the intermittent gear in the clockwise direction would drive the UHP drive gear 54 by segment 52 (PIG. 3) to rotate the UHP tuner through the UHP channels commencing from either the high end of the band or the low end of the band depending on the position of the tuner. It should be obvious in the aforedescribed example that should the person rotating the intermittent gear in a clockwise direction for VHP tuning decide to reverse direction and rotate the gear 48 in a counter clockwise direction to return to "UI-IP tuning without going through all of the VHP Channels, the three teeth would then move the UHP tuner back through the first one-half of the blank area, and the tuner would be set to rotate back through the UHP Channels.

The tuning device also has provisions for fine tuning both the VHP and UHP Channels with a single fine tune knob 17 connected to the fine tune drive shaft 70 which is rotatably supported by the cabinet 34 and support panel 33. The fine tune gear train includes drive gear 72 which engages with an idler gear 7d. The gear 74 is mounted to a shaft '75 and is used to permit the spacing of the fine tune drive shaft 7d clear of the dial Scale 15. The idler 7:1 engages the VHP fine tune drive gear 76 which is connected to the VHP fine tune shaft 25. The fine tune shaft is connected through a gear train located generally at S0 to the fine tuning adiustment for each VHP channel. The gear ratio is such between the idler 74 and the drive gear 76 that the shaft 25 turns slowly upon operation of the fine tuning knob 17 to provide accurate fine tuning. Another gear 33 in the fine tune gear train is connected to the fine tune shaft 25 and rotates with it. This gear drives through gear S4 mounted on a hollow shaft 85 supported hy drive shaft 35. Also mounted on shaft S5 is a gear 87 which engages the UHP fine tune drive gear t). This gear 9h is mounted through a clutch assembly 91 (PIG. 5) to a portion 92 of the U'P drive gear that is connected to the UHP drive shaft 29. The gear assembly 90 has a split hub 93 (PIG. 5) that is resiliently clamped by a spring 95 to the portion 92 of the UHP drive gear e, to form the clutch 91. The gear ratio between the VHP fine tune drive gear 76, and the `UHP fine tune drive gear 90 is such that rotation of the fine tune knobs 17 will cause very slow rotation of the UHP drive shaft 29 to fine tune the UHP Channels.

Operation of the invention can be understood by referring to PiGS. 6 through 9 of the drawing. Those gears which take an active part in each of the tuning functions are indicated in solid while the rcniaining gears are shown in phantom. it should be understood that the channel selector knob lt? may be rotatcd in either a clockwise or counter clockwise direction while tuning the television receiver through the UHP and VHP Channels.

PIG. 6 illustrates UHP coarse tuning. Rotating the channel selector knob 1d either clockwise or counter clockwise through the UHP Channels causes the channel selector shaft to rotate to drive the channel selector drive gear 37. This gear engages gear 39 which rotates and [urns two idler gears 42 and with it. Gear [32 and gear 43 form a drive back gear train so that as the channel selector shaft 35 is turned, the gear 42 will be rotated by gears 37 and 39 to rotate gear 43 which turns the dial scale to the correct UHP station. Idler gear 4-5 which also rotates with gear 39 engages an idler gear e connected to intermittent gear 48. Rotation of the intermittent gear 48 engages gear segment 52 with UHP drive gear 54'. to rotate the UHP tuning shaft 29 to rotate the UHP tuner 23 through the UHP Channels. As the segment 52 rotates to drive gear 54, the blank space on intermittent gear 43 associated with gear segment 55 rotates in a friction contact with the web portion 65 (PIG. 4) thereby elfectively looking VHP drive gear 53 so that it cannot turn to rotate the VHP tune shaft.

PIG. 7 illustrates the operation of UHP fine tuning. Whenever one chanves from VHP tuning to UHP tuning. the VHP tuner is positioned in the channel 1 or inoperative position. Therefore, by turning the fine tuning knob E7, the fine tune shaft is rotated, rotating gear 72. to drive gear 74 which in turn drives the VHP fine tune drive 76. This gear 76 rotates to drive the VHP fine tune shaft 25 (PIG. 5), but since the VHP tuner is in the channel 1 or inoperat-ive position, the rotation of the fine tune shaft 25 has no effect on VHP tuner. The motion of the shaft 78 is also translated through gear 83 to gear 84, gear 87 and then to the UHP fine tune gear 90. The fine tune gear 90 rotates to fine tune the UHP tuner 23. As the shaft 29 rotates, the motion is driven back through UHP drive gear 54, gear segment 52 of intermittent gear 438 and idler gears 46 and 45, to rotate gear 39 and idler gear 42 in the drive back gear train thereby moving gear 43 which repositions the dial scale to indicate the correct UHP channel.

Coarse tuning of the VHP Channels is shown in PIG. 8. Rotation of the channel selector knob 10 causes the channel selector shaft 35 to rotate in a manner heretofore described which rotates selector drive gear 37 to move interrnittent gear 48. Por VHP tuning, as the intermittent gear 48 rotates, the gear segment 55 on the periphery thereof, engages the VHP drive gear 58 connected to the shaft 24-. This rotates the shaft 24 to tune the variable stepwise tuner 22 through the VHP Channels. The blank spot on intermittent gear associated with gear segment 52 is in a friction contact with the web portion 61 of the UHP drive gear 5'4 thereby locking the drive gear and preventing the rotation of the UHP tuning shaft 29. The motion of the channel seiector shaft 3-5 is driven back through the drive back gear train as previously described, to position the dial scale 15* to indicate the VHP stations to which the receiver is tuned.

PIG. 9 illustrates VHP fine tuning. The fine tune knob E17 is rotated to move fine tune drive shaft 70 which rotates gear 72 and 75 to rotate VHP fine tune drive gear 76. The rotation of the gear 76 causes the VHP fine tune drive shaft 2.5 to rotate to fine tune the VHP tuner. The rotation of knob 17 is also translated through the remainder of the fine tune drive train as described for UHP fine tune. However, because the blank portion on intel'- rnittent gear is in a friction contact with the web portion 31 on the UHP drive gear 54, this gear is locked, and since gear 5d is connected to the UHP shaft 29, this shaft is also locked. Therefore, as the UHP fine tune drive gear is rotated the clutch structure 91 formed by spring 95 disengages the gear t from the locked shaft 29, allowing the gear 9h to slip around the shaft 29 without ro- 'rating the same to effectively eliniinate the UHP fine tuning feature while fine tuning VHP.

What has been described is a device for tuning both the VHP and UHP tuners of a television receiver with one knob for coarse tuning and one knob for fine tuning and wherein the knobs can be rotated either in a clockwise or counter clockwise direction. A single dial scale indicates the tuner setting for any adjustment to appear as though the device comprises one continuous tuner. The device also enhances the styling of the receiver cabinet and reduces production costs.

I claim:

1. A device for tuning a television receiver capable of receiving U-lF and VHF signals, including in combination, a stepwise variable VHP tuner having a main tuning shaft and first gear means coupled to said shaft for turning the same, a continuously variable UHF tuner having a tuning shaft and including second gear means coupled to said shaft for turiiing the same, channel selector means, a rotatable member having a first gear segment about the periphery thereof for engaging and driving said first gear means during a portion of the rotation of said rotatable member, and a second gear segment adjacent to said first segment on said periphery for engaging and driving said second gear means during a portion of the rotation of said rotatable member different from that portion of rotation of said member driving said first gear means, and third gear means coupling said channel selector means to said rotatable member for driving the same, whereby continuous rotation of the channel selector means in a clockwise or counter cloekwise direction drives said third gear means to rotate said rotatable member to alternately engage one of said first and second gear segments with one of said first and second gear means lfor tuning the television receiver through all of the UHF and VHP channels.

2. The combination of claim 1 with the gear ratio between said first gear means and said first gear segment on said rotatable member being different than the gear ratio between said second gear means and said second gear segment thereby providing a predetermined mechanical advantage between said channel selector means and said stepwise Vt-F tuner, and said channel selector means and said continuous UHF tuner.

3. A device for tuning a television receiver capable of receiving UHF and VHF signals, including in combination, a stepwise VHP tuner including first gear means for tuning the same through the VHF channels, a continuous UHF tuner having a blank area and including second gear means for tuning the same through the UHF Channels, Channel selector means, a rotatable member having a first gear segment about the periphery thereof for engaging and driving said first gear means during a portion of the rotation of said rotatable member, and a second gear segment adjacent to said first gear segment on said periphery for engaging and driving said second gear means during the initial and terminal portions of rotation of Said rotatable member driving said first gear means and during a portion of said rotation of said member different from that portion of said rotation driving said first gear means, said second gear means being driven during the initial and terminal portions of rotation of said member to drive said UHF tuner through said blank area so that it can be continuously tuned during said portion of rotation of said member driving only said second gear means, and third gear means coupling said channel selector means to said rotatable member for driving the same, whereby continuous rotation of the channel selector means in a clockwise or counter clockwise direction drives said third gear means to rotate said rotatable member to drive said first and second gear means for tuning the television receiver through all of the UHF and VHP Channels.

4. A device for tuning a television receiver capable of receiving UHF and VHP signals, including in combination, a stepwise variable VHP tuner having a first tuning shaft and a fine tuning shaft, a continuously variable UHF tuner having a second tuning shaft, first and second gear means coupled to said first and second tuning shafts respectively, said second gear means having a webbed portion thereon, an intermittent gear meinbc having first and second gear segments which alternately engage at least one of said first and second gear means, one of said gear segments having a toothless portion thereon, channel selector means, means coupling said channel selector means to said intermittent gear member, a fine tune gear train, clutch means, said gear train including a first gear coupled to said fine tuning shaft and a second gear coupled through said clutch means to said second tuning shaft, control means for driving said gear train, said intermittent gear being responsive to movement of said channel selector means to drive said first gear means to tune said VHP tuner, and said toothless portion on said intermittent gear engaging said webbed poition on said second gear means to lock the same thereby locking said second tuning shaft, whereupon driving said fine tune gear train by said control means said first gear moves to rotate said fine tune shaft to fine tune said VHF tuner with said second gear slipping on said second shaft at said clutch to prevent fine tuning said UHF tuner.

5. A device for tuningia television receiver capable of receiving UHF and VHF transmission and having a dial providing visual means for identifying the channel to which the receiver is tuned, the device including in combination, a stepwise variable VHF tuner having a first tuning shaft and a fine tuning shaft, a continuously variable UHF tuner having a second tuning shaft, first and second gear means coupled to said first and second shafts respectively, an intermittent gear member interruptedly engaging at least one of said first and second gear means, channel selector means, means coupling said channel selector means to said intermitteiit gear member, third gear means coupled between said intermittent gear member and the dial, said third gear means being responsive to rotation of said channel selector means to drive back to position the dial to indicate the channel to which the receiver is tuned, a fine tune gear train including a first gear coupled to said fine tuning shaft and a second gear coupled to said second tuning shaft, control means for driving said gear train, said intermittent gear being responsive to niovement of said channel selector means to drive said second gear means to tune said UHF tuner, said driving of said fine gear train by said control means rotating said second gear to rotate said second shaft to fine tune said UHF tuner, whereby said rotation of said second shaft drives bach to said second gear means and said interniittent gear to rotate said third gear means to position the dial to indicate the UHF channel to which the receiver is tuned.

6. A device for tuning a television receiver, including in combination, a UHF drive shaft for a continuously variable tuner, a VHP drive shaft for a switch-type tuner, a first control shaft to be rotated for coarse adjustment of said tuners, a continuous dial to indicate the adjustment of said tuners, a first gear di'iven by said first control shaft, first gear means coupling said first gear to said dial for driving the same, rotatable means driven by said first gear means and having first and second gear segments for driving further gears for only a portion of the rotation of said rotatable means, a second gear on said UHF drive shaft and coupled to said first gear segment, a third gear on said Vl-li` drive shaft and coupled to said second gear segment, the position of said first and second gear segments and said second and third gears providing alternate drive of said UHF and VHF drive shafts with continuous rotation of said first control shaft, a second control shaft to be vrotated for fine adjustment of said tuners, a fine tuning shaft for said switch type tuner, second gear means drivingly connecting said second control shaft to said fine tuning shaft, third gear means and a clutch coupling said fine tuning shaft to said UHF drive shaft through said clutch for driving said UHF drive shaft 'from said fine tuning shaft, said UHF drive shaft Operating said dial through said second gear, said rotatable means, and the driving connection of said first gear means to said rotatable means, aiid said clutch slipping with rotation of said fine tuning shaft and said second gear positioned adjacent a non-driving poi'tion of said first gear segment and said first control shaft in a VHP tuning position.

'7. A device for tuning a television receiver, including in combination, a. UHF drive shaft for a continuously variabio tuner, a VlF drive shaft for a switch-type tuner, a

channel selector shaft to be rotated for coarse adjustment of said tuners, a continuous dial scale to indicate adjustment of said tuners, a channel seiector drive gear driven by said channel selector sha'ft, drive back gear means coupling said selector drive gear to said dial scale for driving the same, an intermittent gear driven by said selector drive gear and having first and second gear segments for driving further gears for only a portion of the rotation of said intermittent gear, a UHF drive gear on said UHF drive shaft and coupled to said first gear segment, a VHF drive gear on said VHF drive shaft and coupled to said second gear segment, the position of said first and second gear segments and said UHF and VHF drive gears providing alternate drive of said UHF and VHF drive shafts With continuous rotation of said channei selector shaft, a fine tune control shaft to -be rotated for fine adjustment of said tuners, a fine tuning shaft for said switch type tuner, first gear means drivingly connecting said fine tune control sha'ft to said fine tuning shaft, second gear means and a clutch coupling said fine tune shaft to said UHF drive shaft through said clutch for driving said UHF drive shaft from said fine tuning shaft, said UHF drive shaft Operating said dial scale through said UHF drive gear, said intermittent gear, and the driving connection of said drive back gear train to said intermittent gear, and said clutch slipping With rotation of said fine tuning shaft and said UHF drive gear positioned adjacent a non-driving portion of said first gear 1G segment and said channel selector shaft in a VHF tuning position.

8. A multi-band tuning unit capable of tuning through first and second signal bands including in combination, first tuning means for signals in the first signal band having an off position and second tuning means for signals in the second signal band, signal selector means, a rotatable member having first and second portions dsposed in a spaced relationship about the periphery thereof, said portions selectively engaging said first and second tuning means respectively for driving the same, and means rotatably connecting said signal selector means to said rotatable member Whereby continued rotation of said signal selector means in a clockwise or counter clockwise direction rotates said rotatable member to engage at least one said portion thereof With said respective tuning means to tune the multi-band tuning unit through the off position of said first tuning means from either direction and through the first and second signal bands.

References Cited UNITED STATES PATENTS MILTON KAUFMAN, Primary Examiner. 

